Near-Infrared Light-Absorbing Film Composition for Camera Modules
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Solution Overview
Problem
Conventional near-infrared light-absorbing films for electronic devices, such as camera modules, face challenges with high viscosity in copper sulfonate salt solutions and limited UV absorption capabilities of organic dyes, leading to suboptimal performance in reducing optical distortion.
Innovation Solution
A composition for near-infrared light-absorbing films incorporating a binder, specific organic dyes represented by Chemical Formulas 1 and 2, and optionally a cyanine-based or phthalocyanine-based dye, which are formulated to optimize UV absorption and light transmittance across various wavelength spectra, reducing viscosity and enhancing film performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper sulfonate salt is used in high concentration to achieve effective near-infrared light absorption, then the light absorption performance is improved, but the viscosity of the solution increases excessively making thin film manufacture difficult
Solution Approach 1:
The patent changes the chemical composition parameters by replacing copper sulfonate salt with specific organic dyes (cyanine-based, phthalocyanine-based, or diimmonium-based dyes) that have different absorption characteristics. This substitution allows achieving the required near-infrared light absorption at lower concentrations, thereby reducing solution viscosity while maintaining effective optical performance.
Solution Approach 2:
The patent employs composite dye formulations combining different types of organic dyes (cyanine-based, phthalocyanine-based, and/or diimmonium-based dyes) to achieve synergistic effects. This composite approach enables effective near-infrared light absorption with optimized concentration levels, resolving the viscosity problem associated with high concentration single-component solutions.
2Ease of manufacture
If organic dye is used instead of copper sulfonate salt to reduce viscosity, then the ease of manufacture is improved, but the UV absorption capability becomes limited resulting in degraded performance
Solution Approach 1:
The patent selects organic dyes that possess dual functionality: they effectively absorb near-infrared light while also providing adequate UV absorption capability. The specified dye classes (cyanine-based, phthalocyanine-based, diimmonium-based) are chosen for their broad spectral absorption characteristics, enabling them to perform multiple optical functions simultaneously, thus maintaining overall performance while reducing viscosity.
Solution Approach 2:
The patent optimizes the chemical structure parameters of the organic dyes by selecting specific classes with extended conjugation and appropriate substituent groups. These structural modifications enhance both UV and near-infrared absorption capabilities, allowing the dyes to compensate for any potential UV absorption limitations while maintaining low solution viscosity.
3Manufacturing precision
If the near-infrared light-absorbing film is made thinner to improve manufacturing precision, then the film quality is improved, but the light absorption effectiveness may be reduced
Solution Approach 1:
The patent changes the optical parameters of the film by using organic dyes with significantly higher molar extinction coefficients compared to copper sulfonate salt. This allows achieving the required light absorption effectiveness in thinner films, as the enhanced dye potency compensates for the reduced film thickness, maintaining optical performance while improving manufacturing precision.
Solution Approach 2:
The patent uses composite dye formulations that maximize light absorption efficiency per unit thickness. By combining different dye classes with complementary absorption spectra and high extinction coefficients, the formulation achieves effective near-infrared light absorption in thin film configurations, resolving the trade-off between thickness and absorption effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition effectively reduces optical distortion by selectively absorbing near-infrared light while maintaining high transmittance in visible wavelength spectra, improving the operational performance of electronic devices with camera modules.
Implementation Method 1
a compound of formula 1 or a compound of formula 2... an absorbance at a maximum absorption wavelength (λmax) that is at least about 20 times as great as an absorbance at a wavelength of about 550 nm
Implementation Method 2
The composition may have an average light transmittance of less than or equal to about 3% in a wavelength spectrum of light of about 700 nm to about 740 nm
Data Source
AI summary
A composition for a near-infrared light-absorbing film includes a binder, a compound represented by Chemical Formula 1, and a compound represented by Chemical Formula 2, wherein a total amount of the compound represented by Chemical Formula 1 and the compound represented by Chemical Formula 2 ranges from about 2.0 parts by weight to about 2.6 parts by weight based on 100 parts by weight of the binder. A near-infrared light-absorbing film may include a near-infrared light-absorbing layer including a cured product of the composition. A camera device may include the near-infrared light-absorbing film, and an electronic device may include the camera device.